Enthalpy of formation
Enthalpy change when one mole of a substance is formed from its constituent elements with all the substances in their standard states.
Exo/endo
Enthalpy of combustion
Enthalpy change when one mole of s substance undergoes complete combustion in oxygen.
Exo
First Ionisation Enthalpy
The first ionisation energy is the Enthalpy change when one mole of gaseous atoms loses one electron per atom to produce gaseous 1+ ions.
Endo
Second Ionisation Enthalpy
The second ionisation energy is when one mole of gaseous 2+ ions is produced from one mole of 1+ ions.
Endo
First electron affinity
The first electron affinity is the Enthalpy change when one mole of gaseous atoms gains one electron per atom to produce gaseous 1- ions.
Exo
Second electron affinity
The second electron affinity is the Enthalpy change when one mole of gaseous 1- ions gains one electron per ion to produce gaseous 2- ions.
Endo
Enthalpy of atomisation
When one mole of gaseous atoms is produced from an element in its normal state.
Endo
Hydration Enthalpy
Enthalpy change when one mole of gaseous ions becomes hydrated (dissolved in water).
Exo
Enthalpy of solution
Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other.
Exo/endo
Bond dissociation Enthalpy
Enthalpy change when one mole of covalent bonds is broken in the gaseous state.
Endo
Lattice Enthalpy of formation
Enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase.
Exo
Lattice Enthalpy of dissociation
Enthalpy chnage when one mole of a solid ionic compound is broken up into its constituent ions in the gas phase.
Endo
Perfect ionic model
Ions are perfect spheres with no covalent character
